[v9]: Enable privacy masking for screenshots by default

[denrase]

📜 Description

Enable privacy masking for screenshots by default

💡 Motivation and Context

Closes #2640

💚 How did you test it?

Existing tests.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

[github-actions]

🚨 Detected changes in high risk code 🚨

High-risk code has higher potential to break the SDK and may be hard to test. To prevent severe bugs, apply the rollout process for releasing such changes and be extra careful when changing and reviewing these files:

• flutter/lib/src/screenshot/recorder.dart

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.73%. Comparing base (75e3eba) to head (544237e).
Report is 1 commits behind head on v9.

Additional details and impacted files

@@            Coverage Diff             @@
##               v9    #2728      +/-   ##
==========================================
+ Coverage   88.50%   89.73%   +1.23%     
==========================================
  Files         262       91     -171     
  Lines        8758     2952    -5806     
==========================================
- Hits         7751     2649    -5102     
+ Misses       1007      303     -704     

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[buenaflor]

lgtm 👍